matroska: Mark S_TEXT/UTF-8 as Subrip encoded subtitles.

While not explicitly stated in the specs, the original author
has stated that S_TEXT/UTF-8 is expected to be text using Subrip
markup, but without Subrip in-band timing.

So, now that we have a decoder that conforms to this expectation,
let's use it.

Note that this change will impact tools that use libavformat. If
they expect srt subtitles to have CODEC_ID_TEXT, they must be
adjusted to expect CODEC_ID_SUBRIP. The actual content is, obviously,
unchanged.

Signed-off-by: Philip Langdale <philipl@overt.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/Changelog b/Changelog
index 801cbff..e42f7c6 100644
--- a/Changelog
+++ b/Changelog
@@ -52,6 +52,8 @@ version next:
 - ffmpeg -shortest option is now per-output file
 - volume measurement filter
 - Ut Video encoder
+- Matroska demuxer now identifies SRT subtitles as AV_CODEC_ID_SUBRIP
+  instead of AV_CODEC_ID_TEXT
 
 
 version 0.11: